Olathe (KS)
September
Weather in Olathe, Kansas for September 2026
Your guide to Olathe weather in September - trends and predictions
So far, September 2026 in Olathe shows a warmer trend than usual by 3.3 °F.
The forecast for the upcoming days in Olathe predicts a temperature of 26.3 °F, which is slightly above the historical average.
In general, the average temperature in Olathe at the beginning of September is 31 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.9 °F by the end of September.
The climate of Olathe in September is notably wet, with an average of 11 rainy days, and a total of 323.4 mm of precipitation.
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Temperatures
Rain 🌧️
More
19
Dry days
11
Rainy days
0
Snow days
26°/16°
Temperatures
18 km/h
Avg max wind
77 %
Avg humidity
Olathe Weather September
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Temperatures trend during September in Olathe
See the weather trend as well as the moving average line
September weather in Olathe day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate or heavy rain shower | 29° /18° | 16.1 mm | 7 | |
| Sept. 2 |  Mist | 31° /19° | 0 mm | 7 | |
| Sept. 3 | Fog | 33° /19° | 6.2 mm | 8 | |
| Sept. 4 | Fog | 31° /18° | 3.8 mm | 7 | |
| Sept. 5 | Moderate or heavy rain shower | 28° /17° | 3.7 mm | 4 | |
| Sept. 6 | Fog | 32° /17° | 5.1 mm | 5 | |
| Sept. 7 |  Sunny | 33° /16° | 0 mm | 8 | |
| Sept. 8 |  Overcast | 31° /18° | 1.4 mm | 7 | |
| Sept. 9 |  Heavy rain | 26° /19° | 25.9 mm | 5 | |
| Sept. 10 |  Thundery outbreaks possible | 26° /20° | 4.7 mm | 3 | |
| Sept. 11 |  Cloudy | 32° /18° | 0 mm | 8 | |
| Sept. 12 | Sunny | 33° /18° | 3.5 mm | 7 | |
| Sept. 13 | Sunny | 30° /18° | 1.7 mm | 6 | |
| Sept. 14 | Cloudy | 34° /18° | 0 mm | 8 | |
| Sept. 15 |  Partly cloudy | 33° /21° | 7.1 mm | 8 | |
| Sept. 16 | Sunny | 33° /20° | 10.4 mm | 7 | |
| Sept. 17 | Thundery outbreaks possible | 33° /22° | 0.2 mm | 7 | |
| Sept. 18 |  Light rain shower | 30° /22° | 40.1 mm | 7 | |
| Sept. 19 | Fog | 32° /18° | 3.1 mm | 7 | |
| Sept. 20 | Moderate or heavy rain shower | 21° /17° | 8.3 mm | 3 | |
| Sept. 21 | Mist | 24° /17° | 0.6 mm | 4 | |
| Sept. 22 | Patchy rain possible | 20° /15° | 0.3 mm | 2.5 | |
| Sept. 23 | Sunny | 23° /12° | 0 mm | 6.8 | |
| Sept. 24 | Overcast | 24° /14° | 0 mm | 5.3 | |
| Sept. 25 | Overcast | 25° /18° | 0.5 mm | 5 | |
| Sept. 26 | Overcast | 25° /18° | 1.7 mm | 6 | |
| Sept. 27 | Sunny | 29° /19° | 0 mm | 7 | |
| Sept. 28 | Sunny | 30° /20° | 0 mm | 8 | |
| Sept. 29 | Light rain shower | 24° /20° | 7.5 mm | 5 | |
| Sept. 30 | Sunny | 24° /16° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Olathe in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Olathe forecast closer to your planned date for the most up-to-date weather information.
Change Month
Olathe in September - FAQ
What are the expected maximum and minimum temperatures in Olathe during September?
During September, expect a variety of temperatures with highs around 26° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Olathe during September?
Significant rainfall exceeding 323.4 mm is expected in Olathe during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Olathe during September?
The average wind speed in Olathe during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Olathe
Explore the daily rainfall trends and prepare for Olathes September weather 💧
Typically, Olathe has 11 rainy days in September with a total of 323.4 mm of rainfall.
UV exposure in Olathe during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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